/*
 * Copyright � 2002-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using Spring.Messaging.Ems.Common;
using Spring.Objects.Factory;

namespace Spring.Messaging.Ems.Core;

/// <summary>
/// Convenient super class for application classes that need EMS access.
/// </summary>
/// <remarks>
///  Requires a ConnectionFactory or a EmsTemplate instance to be set.
///  It will create its own EmsTemplate if a ConnectionFactory is passed in.
///  A custom EmsTemplate instance can be created for a given ConnectionFactory
///  through overriding the <code>createEmsTemplate</code> method.
///
/// </remarks>
public class EmsGatewaySupport : IInitializingObject
{
    private readonly ILogger<EmsGatewaySupport> logger = LogManager.GetLogger<EmsGatewaySupport>();

    private EmsTemplate emsTemplate;

    /// <summary>
    /// Gets or sets the EMS template for the gateway.
    /// </summary>
    /// <value>The EMS template.</value>
    public EmsTemplate EmsTemplate
    {
        get { return emsTemplate; }
        set { emsTemplate = value; }
    }

    /// <summary>
    /// Gets or sets he EMS connection factory to be used by the gateway.
    /// Will automatically create a EmsTemplate for the given ConnectionFactory.
    /// </summary>
    /// <value>The connection factory.</value>
    public IConnectionFactory ConnectionFactory
    {
        get
        {
            return (emsTemplate != null ? this.emsTemplate.ConnectionFactory : null);
        }
        set
        {
            this.emsTemplate = CreateEmsTemplate(value);
        }
    }

    /// <summary>
    /// Creates a EmsTemplate for the given ConnectionFactory.
    /// </summary>
    /// <remarks>Only invoked if populating the gateway with a ConnectionFactory reference.
    /// Can be overridden in subclasses to provide a different EmsTemplate instance
    /// </remarks>
    ///
    /// <param name="connectionFactory">The connection factory.</param>
    /// <returns></returns>
    protected virtual EmsTemplate CreateEmsTemplate(IConnectionFactory connectionFactory)
    {
        return new EmsTemplate(connectionFactory);
    }

    /// <summary>
    /// Ensures that the JmsTemplate is specified and calls <see cref="InitGateway"/>.
    /// </summary>
    public virtual void AfterPropertiesSet()
    {
        if (emsTemplate == null)
        {
            throw new ArgumentException("connectionFactory or jmsTemplate is required");
        }

        try
        {
            InitGateway();
        }
        catch (Exception e)
        {
            throw new ObjectInitializationException("Initialization of the EMS gateway failed: " + e.Message, e);
        }
    }

    /// <summary>
    /// Subclasses can override this for custom initialization behavior.
    /// Gets called after population of this instance's properties.
    /// </summary>
    protected virtual void InitGateway()
    {
    }
}